/*

 * link_veth.c	veth driver module

 *

 *		This program is free software; you can redistribute it and/or

 *		modify it under the terms of the GNU General Public License

 *		as published by the Free Software Foundation; either version

 *		2 of the License, or (at your option) any later version.

 *

 * Authors:	Pavel Emelianov <xemul@openvz.org>

 *

 */

#include <string.h>

#include <net/if.h>

#include <linux/veth.h>

#include "utils.h"

#include "ip_common.h"

static void print_usage(FILE *f)

{

	printf("Usage: ip link <options> type veth [peer <options>]\n"

	       "To get <options> type 'ip link add help'\n");

}

static void usage(void)

{

	print_usage(stderr);

}

static int veth_parse_opt(struct link_util *lu, int argc, char **argv,

			  struct nlmsghdr *n)

{

	char *type = NULL;

	int err;

	struct rtattr *data;

	struct ifinfomsg *ifm, *peer_ifm;

	unsigned int ifi_flags, ifi_change, ifi_index;

	if (strcmp(argv[0], "peer") != 0) {

		usage();

		return -1;

	}

	ifm = NLMSG_DATA(n);

	ifi_flags = ifm->ifi_flags;

	ifi_change = ifm->ifi_change;

	ifi_index = ifm->ifi_index;

	ifm->ifi_flags = 0;

	ifm->ifi_change = 0;

	ifm->ifi_index = 0;

	data = addattr_nest(n, 1024, VETH_INFO_PEER);

	n->nlmsg_len += sizeof(struct ifinfomsg);

	err = iplink_parse(argc - 1, argv + 1, (struct iplink_req *)n, &type);

	if (err < 0)

		return err;

	if (type)

		duparg("type", argv[err]);

	peer_ifm = RTA_DATA(data);

	peer_ifm->ifi_index = ifm->ifi_index;

	peer_ifm->ifi_flags = ifm->ifi_flags;

	peer_ifm->ifi_change = ifm->ifi_change;

	ifm->ifi_flags = ifi_flags;

	ifm->ifi_change = ifi_change;

	ifm->ifi_index = ifi_index;

	addattr_nest_end(n, data);

	return argc - 1 - err;

}

static void veth_print_help(struct link_util *lu, int argc, char **argv,

	FILE *f)

{

	print_usage(f);

}

struct link_util veth_link_util = {

	.id = "veth",

	.parse_opt = veth_parse_opt,

	.print_help = veth_print_help,

};